A list of Illinois state communities and their associated web pages.
- Sadorus
- Sailor Springs
- Saint Anne
- Saint Augustine
- Saint Charles
- Saint David
- Saint Elmo
- Saint Francisville
- Saint Jacob
- Saint Joseph
- Saint Libory
- Saint Peter
- Sainte Marie
- Salem
- San Jose
- Sandoval
- Sandwich
- Sauget
- Sauk Village
- Saunemin
- Savanna
- Savoy
- Sawyerville
- Saybrook
- Scales Mound
- Schaumburg
- Scheller
- Schiller Park
- Sciota
- Scioto Mills
- Scottville
- Seaton
- Seatonville
- Secor
- Seneca
- Serena
- Sesser
- Seward
- Seymour
- Shabbona
- Shannon
- Shattuc
- Shawneetown
- Sheffield
- Shelbyville
- Sheldon
- Sheridan
- Sherman
- Sherrard
- Shields
- Shiloh
- Shipman
- Shirland
- Shirley
- Shobonier
- Shorewood
- Shumway
- Sibley
- Sidell
- Sidney
- Sigel
- Silvis
- Simpson
- Sims
- Skokie
- Sleepy Hollow
- Smithboro
- Smithfield
- Smithshire
- Smithton
- Solon Mills
- Somonauk
- Sorento
- South Beloit
- South Elgin
- South Holland
- South Jacksonville
- South Pekin
- South Roxana
- South Wilmington
- Sparland
- Sparta
- Speer
- Spring Grove
- Spring Valley
- Springerton
- Springfield
- Standard
- Standard City
- Stanford
- Staunton
- Steeleville
- Steger
- Sterling
- Steward
- Stewardson
- Stillman Valley
- Stockland
- Stockton
- Stonefort
- Stonington
- Stoy
- Strasburg
- Strawn
- Streamwood
- Streator
- Stronghurst
- Sublette
- Sugar Grove
- Sullivan
- Summerfield
- Summit
- Summit Argo
- Sumner
- Sunnyland
- Swansea
- Sycamore
- Table Grove
- Tallula
- Tamaroa
- Tamms
- Tampico
- Taylor Ridge
- Taylor Springs
- Taylorville
- Techny
- Tennessee
- Teutopolis
- Texico
- Thawville
- Thayer
- Thebes
- Thomasboro
- Thompsonville
- Thomson
- Thornton
- Tilden
- Tilton
- Timewell
- Tinley Park
- Tiskilwa
- Toledo
- Tolono
- Toluca
- Tonica
- Topeka
- Toulon
- Tovey
- Towanda
- Towers Lake
- Tremont
- Trenton
- Trilla
- Triumph
- Trivoli
- Troy
- Troy Grove
- Tunnel Hill
- Tuscola
- Ullin
- Union
- Union Hill
- Unity
- University Park
- Urbana
- Ursa
- Utica
- Valier
- Valmeyer
- Van Orin
- Vandalia
- Varna
- Venice
- Vergennes
- Vermilion
- Vermont
- Vernon
- Vernon Hills
- Verona
- Versailles
- Victoria
- Vienna
- Villa Grove
- Villa Park
- Villa Ridge
- Viola
- Virden
- Virgil
- Virginia
- Volo
- Wadsworth
- Waggoner
- Walnut
- Walnut Hill
- Walsh
- Walshville
- Waltonville
- Wapella
- Warren
- Warrensburg
- Warrenville
- Warsaw
- Wasco
- Washburn
- Washington
- Washington Park
- Wataga
- Waterloo
- Waterman
- Watseka
- Watson
- Wauconda
- Waukegan
- Waukegan Twp
- Waverly
- Wayne
- Wayne City
- Waynesville
- Wedron
- Weldon
- Wellington
- Wenona
- West Brooklyn
- West Chicago
- West Dundee
- West Frankfort
- West Liberty
- West Point
- West Salem
- West Union
- West York
- Westchester
- Western Springs
- Westfield
- Westmont
- Westville
- Wheatland
- Wheaton
- Wheeler
- Wheeling
- White Hall
- White Heath
- Whittington
- Williamsfield
- Williamsville
- Willisville
- Willow Hill
- Willow Springs
- Willowbrook
- Wilmette
- Wilmington
- Wilsonville
- Winchester
- Windsor
- Winfield
- Winnebago
- Winnetka
- Winslow
- Winthrop Harbor
- Witt
- Wolf Lake
- Wonder Lake
- Wood Dale
- Wood River
- Woodhull
- Woodland
- Woodlawn
- Woodridge
- Woodson
- Woodstock
- Woosung
- Worden
- Worth
- Wrights
- Wyanet
- Wyoming
- Xenia
- Yale
- Yates City
- Yorkville
- Zion
- Zeigler